Ball milled Mg/Al hydroxides modified nitrogen-rich biochar for arsenic removal: performance and governing mechanism

• DOI: 10.1007/s44246-023-00063-3
• Publication Date: 2023-08-21T06:02:37Z
• Authors: Ming Wang; Jinlong Yan; Yusen Diao; Xiangqian Zhou; Ting Luo; Hui Wang; Guixiang Quan; Xinyu Sun; Jun Wang
• Keywords: 01 natural sciences; 0105 earth and related environmental sciences

Abstract Layered double hydroxides (LDHs) are widely used as effective adsorbents for wastewater treatment due to their simple synthesis, controllable structure, strong stability, large surface area, and interfacial spacing. In this study, modified-biochar (BMBC) Mg/Al composite (Mg/Al-BC) were directly prepared using ball milling technology effectively adsorb As(V), nitrogen-rich biochar was obtained through pyrolysis shrimp shells precursors. Compared pristine biochar, the oxygen-containing functional groups of Mg/Al-BC increased by 71.9%, particle average diameter decreased from 14.26 nm 12.56 nm. The kinetics isothermal models arsenic adsorption examined in batch experiments investigate impacts pH, temperature, co-existing anions. capacities As(V) followed order: > BMBC BC, with respective maximum measured at 22.65, 6.73, 0.48 mg/g. adsorbed onto dependent on pH coexisting Precipitation, ion exchange, complexation, electrostatic interaction possible governing mechanisms. Protonation pyridinic-N/quinone contributed attraction between anion quaternary ammonium cation. Stable reusability indicates that milled could be a promising adsorbent arsenate removal polluted water. Graphical